int titleToNumber(char* columnTitle)
{
        char *ans;
    while(columnTitle!=0)
    {
        char remainder = columnTitle % 26;
        if(remainder==0)
        {
            remainder = 26;
            columnTitle -= 26;
        }
        ans += remainder + 'A' -1;
        columnTitle /= 26;
        printf("%s",ans) ;
    }
    
}